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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...

Olefin Metathesis Polymerization: Overview

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...

Anionic Chain-Growth Polymerization: Overview

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...

Cycloaddition Reactions: MO Requirements for Thermal Activation

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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...

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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes

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Ring-opening metathesis polymerization-based recyclable magnetic acylation reagents.

Quirin M Kainz¹, Roland Linhardt, Pradip K Maity

¹Institute for Organic Chemistry, University of Regensburg, Universitätsstr. 31, 93053 Regensburg, Germany.

|February 22, 2013

Summary

This study introduces a simple method for amine acylation using magnetic nanoparticles as recyclable supports. These reusable nanobeads offer high efficiency and yield for chemical synthesis, reducing waste.

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Area of Science:

Organic Chemistry
Materials Science
Nanotechnology

Background:

Acylation of amines is a fundamental transformation in organic synthesis.
Developing efficient and recyclable catalytic systems is crucial for sustainable chemistry.
Nanoparticle-supported reagents offer advantages in separation and reusability.

Purpose of the Study:

To develop an operationally simple and recyclable method for amine acylation.
To functionalize magnetic nanoparticles for use as supports in organic reactions.
To investigate the efficiency and reusability of the developed system.

Main Methods:

Carbon-coated cobalt (Co/C) and iron (Fe/C) magnetic nanobeads were synthesized.
Nanoparticles were functionalized with a norbornene tag via click reaction.
Surface activation with Grubbs-II catalyst followed by grafting of acylated N-hydroxysuccinimide ROMP gels.
Application of the hybrid material for the acylation of primary and secondary amines.

Main Results:

High loading of the hybrid material (up to 2.6 mmol/g).
Acylation products obtained in high yields (86-99%) and excellent purities (>95% by NMR).
Magnetic nanoparticles allowed for rapid separation and easy isolation of products.
The catalyst support was successfully reused for up to five cycles without significant loss of activity.

Conclusions:

The reported method provides an efficient, simple, and recyclable approach for amine acylation.
Magnetic nanoparticle supports facilitate easy catalyst recovery and purification of products.
This strategy holds promise for greener and more sustainable chemical synthesis.